ES2300111T3 - PERFECTED ELECTROMAGNETIC VALVE TO DOSAGE A FUEL INJECTOR. - Google Patents

PERFECTED ELECTROMAGNETIC VALVE TO DOSAGE A FUEL INJECTOR. Download PDF

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Publication number
ES2300111T3
ES2300111T3 ES97122647T ES97122647T ES2300111T3 ES 2300111 T3 ES2300111 T3 ES 2300111T3 ES 97122647 T ES97122647 T ES 97122647T ES 97122647 T ES97122647 T ES 97122647T ES 2300111 T3 ES2300111 T3 ES 2300111T3
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Spain
Prior art keywords
spring
injector
rod
armor
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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ES97122647T
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Spanish (es)
Inventor
Mario Ricco
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Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
Priority to ITTO96A1074 priority Critical
Priority to IT96TO001074A priority patent/IT1289794B1/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of ES2300111T3 publication Critical patent/ES2300111T3/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027Electrically actuated valves draining the chamber to release the closing pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012Valves
    • F02M63/0014Valves characterised by the valve actuating means
    • F02M63/0015Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012Valves
    • F02M63/0014Valves characterised by the valve actuating means
    • F02M63/0015Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012Valves
    • F02M63/0014Valves characterised by the valve actuating means
    • F02M63/0015Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • F02M63/0021Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of mobile armatures
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012Valves
    • F02M63/0014Valves characterised by the valve actuating means
    • F02M63/0015Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0017Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
    • F02M63/0021Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of mobile armatures
    • F02M63/0022Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means characterised by the arrangement of mobile armatures the armature and the valve being allowed to move relatively to each other
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012Valves
    • F02M63/0031Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
    • F02M63/0033Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat
    • F02M63/0036Lift valves, i.e. having a valve member that moves perpendicularly to the plane of the valve seat with spherical or partly spherical shaped valve member ends
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0205Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
    • F02M63/022Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine by acting on fuel control mechanism
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/30Fuel-injection apparatus having mechanical parts, the movement of which is damped
    • F02M2200/306Fuel-injection apparatus having mechanical parts, the movement of which is damped using mechanical means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2547/00Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/003Valve inserts containing control chamber and valve piston

Abstract

LA VALVULA DOSIFICADORA (24) TIENE UN ELEMENTO DE CIERRE (44) DE UN CONDUCTO DE DESCARGA (43), Y UN ELECTROIMAN (26) PARA CONTROLAR UN NUCLEO (27) DESCONECTADO DE UN VASTAGO RESPECTIVO (47) Y DESLIZABLE A LO LARGO DEL VASTAGO (47) POR MEDIO DE UN MANGUITO (48) RESPECTIVO. EL VASTAGO (47) ESTA GUIADO POR UN CASQUILLO (53) Y ES EMPUJADO POR UN PRIMER MUELLE (52) PARA MANTENER EL ELEMENTO DE CIERRE (44) EN LA POSICION CERRADA, Y EL NUCLEO (27) SE MANTIENE APOYADO AXIALMENTE CONTRA EL VASTAGO (47) POR UN SEGUNDO MUELLE (64) PRECARGADO ENTRE EL NUCLEO (27) Y UN ESCALON ANULAR (63) DEL VASTAGO (47), PARA NO AFECTAR LA ACCION DEL PRIMER MUELLE (52).THE DOSE VALVE (24) HAS A CLOSING ELEMENT (44) OF A DOWNLOAD CONDUCT (43), AND AN ELECTROIMAN (26) TO CONTROL A NUCLEUS (27) DISCONNECTED FROM A RESPECTIVE SUCCESS (47) AND SLIDING THROUGH VASTAGO (47) THROUGH A HOSE (48) RESPECTIVE. THE VASTAGO (47) IS GUIDED BY A CAP (53) AND IS PUSHED BY A FIRST SPRING (52) TO MAINTAIN THE CLOSURE ELEMENT (44) IN THE CLOSED POSITION, AND THE NUCLEO (27) IS HELD SUPPORTED AXIALALLY AGAINST THE VASTAGO (47) FOR A SECOND SPRING (64) PRE-CHARGED BETWEEN THE NUCLEUS (27) AND AN ANNULAR SCALE (63) OF THE VASTAGO (47), NOT TO AFFECT THE ACTION OF THE FIRST SPRING (52).

Description

Válvula electromagnética perfeccionada para dosificar un inyector de combustible.Electromagnetic valve perfected for dose a fuel injector.
La presente invención se refiere a un inyector de combustible con una válvula electromagnética dosificadora perfeccionada para su uso, en particular, en motores de combustión interna. En general, un inyector de combustible comprende un cuerpo hueco conectado a una tobera que termina con uno o más orificios de inyección; y una varilla de control que se desliza por el interior del cuerpo hueco y está conectada a un pasador para cerrar dichos orificios y una válvula dosificadora.The present invention relates to an injector of fuel with an electromagnetic metering valve perfected for use, in particular, in combustion engines internal In general, a fuel injector comprises a body gap connected to a nozzle that ends with one or more holes of injection; and a control rod that slides inside of the hollow body and is connected to a pin to close said holes and a metering valve.
Las válvulas dosificadoras de inyectores de combustible comprenden normalmente una cámara de control con un conducto de descarga que normalmente es cerrado por un obturador por medio de un resorte principal precargado de fuerza F1, y que se abre mediante la activación de un electroimán con el fin de mover la armadura para contrarrestar la fuerza ejercida por el resorte. En las válvulas conocidas, la armadura está conectada en general rígidamente a un vástago que se desliza por el interior de una guía fija.Injector metering valves fuel typically comprise a control chamber with a discharge duct that is normally closed by a shutter by means of a pre-loaded main force spring F1, and which opens by activating an electromagnet in order to move the armor to counteract the force exerted by the spring. In known valves, the armor is connected in general rigidly to a rod that slides inside a guide fixed.
Cuando se cierra el conducto de descarga, la energía cinética de la armadura y del vástago se disipa en el impacto del obturador contra la válvula; y cuando se abre el conducto de descarga, la energía cinética de la carrera de retorno de la armadura y del vástago se disipa en el impacto del vástago contra un tope.When the discharge duct is closed, the kinetic energy of the armor and the stem dissipates in the shutter impact against the valve; and when the discharge duct, the kinetic energy of the return stroke of the reinforcement and the stem dissipates in the impact of the stem Against a stop.
Dicho impacto genera una fuerza considerable proporcional a la masa y velocidad de la armadura y vástago e inversamente proporcionar a la duración del impacto, la cual es muy corta; y, teniendo en cuenta la dureza la vástago, bola y cuerpo de la válvula, se traduce en un rebote considerable, tanto cuando se abre como cuando se cierra la válvula, de manera que el movimiento de la armadura deja de proporcionar una operación estable del inyector.This impact generates considerable force proportional to the mass and velocity of the reinforcement and rod e inversely provide the duration of the impact, which is very short; and, taking into account the hardness of the stem, ball and body of the valve, translates into a considerable rebound, both when opens as when the valve is closed, so that the movement of the armor ceases to provide a stable operation of the injector.
Una propuesta descrita en EP 753.658 para reducir el rebote de la masa detenida en la carrera tanto de apertura como de cierre, consiste en desconectar la armadura del vástago y proporcionar un resorte precargado adicional de fuerza F2 entre la armadura y un hombro fijo.A proposal described in EP 753,658 for reduce the rebound of the mass stopped in the race both of opening as closing, consists in disconnecting the armor of the stem and provide an additional pre-loaded spring of force F2 between the armor and a fixed shoulder.
La fuerza F1 del resorte principal, que mantiene al obturador en la posición cerrada, actúa sobre el vástago en oposición a la fuerza F2 del resorte adicional, siendo también mayor que dicha fuerza F2. En otra válvula conocida, el vástago está provisto de una pestaña alojada dentro de una cámara en la cual circula combustible y en donde el movimiento de la pestaña crea una cierta cantidad de turbulencia para reducir adicionalmente el rebote.The F1 force of the main spring, which maintains to the shutter in the closed position, acts on the rod in opposition to the force F2 of the additional spring, also being greater than said force F2. In another known valve, the stem is provided with a tab housed inside a camera in which fuel circulates and where the eyelash movement creates a certain amount of turbulence to further reduce the rebound.
Sin embargo, dichas válvulas conocidas presentan el inconveniente de no permitir un pequeño intervalo entre dos movimientos consecutivos de la armadura, tal como se requiere, por ejemplo, en los motores de inyección de alta velocidad. En particular, dichas válvulas son inadecuadas para motores que requieren una preinyección de combustible poco antes de la inyección principal. En cuyo caso, de hecho, la fuerza F2 del resorte adicional tendría que aumentarse para permitir el retorno rápido de la armadura a la posición de descanso después de cada operación, y para asegurar una operación repetida correcta y rápida de la armadura.However, said known valves have the inconvenience of not allowing a small interval between two consecutive movements of the armor, as required, by example, in high speed injection engines. In in particular, said valves are unsuitable for engines that require a fuel pre-injection shortly before the main injection In which case, in fact, the force F2 of additional spring would have to be increased to allow return Quick armor to rest position after each operation, and to ensure correct and fast repeated operation of the armor.
Sin embargo, dado que la fuerza F requerida para cerrar el obturador es igual a F1-F2, el incremento de la fuerza F2 del resorte adicional significaría por necesidad el correspondiente incremento de la fuerza F1 del resorte principal, lo cual es difícil de conseguir teniendo en cuenta el espacio invariablemente pequeño disponible para el resorte principal. Particularmente, en el caso de un resorte principal que comprende un resorte helicoidal alojado dentro del núcleo magnético del electroimán, cualquier incremento del espacio asignado para el resorte principal implicaría por necesidad alterar el circuito magnético, fabricar el núcleo magnético empleando materiales distintos a los sinterizados y dificultades a la hora de montar un resorte con alta precarga.However, since the force F required for close the shutter is equal to F1-F2, the increase of the force F2 of the additional spring would necessarily mean the corresponding increase in force F1 of the main spring, what which is difficult to achieve considering the space invariably small available for the main spring. Particularly, in the case of a main spring comprising a helical spring housed within the magnetic core of the electromagnet, any increase in the space allocated for the main spring would necessarily imply altering the circuit magnetic, fabricate the magnetic core using materials other than sintered and difficulties when mounting a spring with high preload.
Un objeto de la presente invención consiste en proporcionar de forma directa un inyector de combustible provisto de una válvula dosificadora fiable del tipo antes descrito, destinada a solucionar los inconvenientes anteriormente citados y habitualmente asociados con las válvulas conocidas, y que asegura un retorno rápido de la armadura y del vástago de control del obturador a la posición inactiva.An object of the present invention consists in directly provide a fuel injector provided with a reliable metering valve of the type described above, intended to solve the aforementioned problems and usually associated with known valves, and that ensures a quick return of the armature and the control rod of the shutter to inactive position.
De acuerdo con la presente invención, se proporciona un inyector de combustible que comprende un cuerpo hueco conectado a una tobera que termina con uno o más orificios de inyección; una varilla de control, que desliza por el interior del cuerpo hueco y está conectada, en su primer extremo, a un pasador para cerrar dichos orificios, una válvula dosificadora que comprende un obturador para un conducto de descarga de una cámara de control, y recibe un segundo extremo de la varilla de control; un primer resorte que actúa contra un elemento intermedio para mantener dicho obturador en la posición cerrada; y un electroimán para activar una armadura para controlar dicho obturador por vía de dicho elemento intermedio; estando desconectada dicha armadura de dicho elemento intermedio y quedando retenida apoyada contra dicho elemento intermedio por un segundo resorte; caracterizado porque dicho segundo resorte se encuentra precargado entre dicha armadura y dicho elemento intermedio, al objeto de no afectar a la acción de dicho primer resorte.In accordance with the present invention, provides a fuel injector comprising a body gap connected to a nozzle that ends with one or more holes of injection; a control rod, which slides inside the hollow body and is connected, at its first end, to a pin to close said holes, a metering valve comprising a shutter for a discharge duct of a control chamber, and receives a second end of the control rod; a first spring acting against an intermediate element to maintain said shutter in the closed position; and an electromagnet to activate a armor to control said shutter via said element intermediate; said armor being disconnected from said element intermediate and being held leaning against said element intermediate by a second spring; characterized because said second spring is preloaded between said armor and said intermediate element, in order not to affect the action of said first spring.
Se describirán, a modo de ejemplo, dos modalidades preferidas, no limitativas, de la presente invención con referencia a los dibujos adjuntos, en donde:As an example, two will be described preferred, non-limiting embodiments of the present invention with reference to the attached drawings, where:
La figura 1 muestra una vista lateral en sección parcial de un inyector de combustible de acuerdo con la presente invención;Figure 1 shows a sectional side view partial of a fuel injector according to the present invention;
La figura 2 muestra una serie-sección a mayor escala de una válvula dosificadora del inyector de la figura 1 de acuerdo con una primera variante de la invención;Figure 2 shows a larger-scale series-section of a valve metering of the injector of figure 1 according to a first variant of the invention;
La figura 3 muestra una semi-sección parcial de una válvula dosificadora del inyector de acuerdo con otra variante de la invención;Figure 3 shows a partial semi-section of a metering valve injector according to another variant of the invention;
La figura 4 muestra una sección parcial a lo largo de la línea IV-IV de la figura 3;Figure 4 shows a partial section at along line IV-IV of figure 3;
Las figuras 5 y 6 muestran dos semi-secciones parciales de la válvula dosificadora del inyecto de acuerdo con otras dos variantes de la invención.Figures 5 and 6 show two Partial semi-sections of the metering valve of the injection according to two other variants of the invention.
El número 5 en la figura 1 representa un inyector de combustible, por ejemplo, para un motor diesel de combustión interna, que comprende un cuerpo hueco 6 conectado a una tobera 9 que termina con uno o más orificios de inyección 11; y una varilla de control 8 que desliza por el interior del cuerpo 6 y está conectada mediante una placa 10 a un pasador 12 para cerrar el orificio 11.The number 5 in figure 1 represents a fuel injector, for example, for a diesel engine of internal combustion, which comprises a hollow body 6 connected to a nozzle 9 ending with one or more injection holes 11; and one control rod 8 that slides inside the body 6 and is connected by a plate 10 to a pin 12 to close the hole 11.
El cuerpo 6 comprende un apéndice 13 en el que se inserta un adaptador de entrada 16 conectado a una bomba normal de alimentación de combustible, y que, a su vez, comprende un agujero 14 (figura 2) que comunica por vía de los conductos 17, 18 y 21 con una cámara de inyección 19 de la tobera 9; el pasador 12 comprende un hombro 22 sobre el cual actúa el combustible a presión de la cámara 19; y un resorte de compresión 23 ayuda a empujar el pasador 12 hacia abajo.The body 6 comprises an appendix 13 in which an input adapter 16 connected to a normal pump is inserted of fuel supply, and which, in turn, comprises a hole 14 (figure 2) that communicates via ducts 17, 18 and 21 with an injection chamber 19 of the nozzle 9; the pin 12 comprises a shoulder 22 on which the pressurized fuel acts from chamber 19; and a compression spring 23 helps push the pin 12 down.
El inyector 5 también comprende una válvula dosificadora indicada en su conjunto por 24 y que, a su vez, comprende un electroimán 26 para controlar una armadura 27; el electroimán 26 comprende un núcleo magnético anular 28 que aloja una bobina eléctrica normal 29; y el núcleo 28 comprende un agujero central 31 coaxial con un adaptador de descarga 32 acoplado en un cuerpo integrado con el núcleo 28 y conectado con el depósito de combustible.The injector 5 also comprises a valve doser indicated as a whole by 24 and which, in turn, it comprises an electromagnet 26 to control an armature 27; he electromagnet 26 comprises an annular magnetic core 28 that houses a normal electric coil 29; and the core 28 comprises a hole coaxial central 31 with a discharge adapter 32 coupled in a body integrated with core 28 and connected to the tank fuel.
La válvula dosificadora 24 también comprende un cuerpo 33 que tiene una pestaña 34 retenida normalmente apoyada contra un hombro del cuerpo 6 mediante una tuerca anular exteriormente roscada 36, la cual es roscada en una rosca de la cámara de descarga 37 formada en el cuerpo 6; y la armadura 27 presenta una forma sustancialmente de disco y tiene un número, por ejemplo, de tres, sectores 38 (figura 4) separados por ranuras 39 a través de las cuales la cámara de descarga 37 comunica con el agujero central 31 del núcleo 28.The metering valve 24 also comprises a body 33 having a retained flange 34 normally supported against a shoulder of body 6 using an annular nut externally threaded 36, which is threaded into a thread of the discharge chamber 37 formed in body 6; and the armor 27 it has a substantially disk shape and has a number, for example, of three, sectors 38 (figure 4) separated by slots 39 to through which the download chamber 37 communicates with the core hole 31 of core 28.
El cuerpo 33 de la válvula 24 también comprende una cámara de control axial 41 que, a su vez, comprende un conducto de entrada 42 que comunica con el agujero 14 y un conducto de descarga 43 que comunica con la cámara de descarga 37. La cámara de control 41 está definida, en la parte inferior, por la superficie superior de la varilla 8; y, en virtud del mayor área de la superficie superior de la varilla 8 en comparación con la del hombro 22 (figura 1), la presión del combustible, con ayuda del resorte 23, mantiene a la varilla 8 normalmente en una posición tal que cierra el orificio 11 de la tobera 9.The body 33 of the valve 24 also comprises an axial control chamber 41 which, in turn, comprises a conduit of inlet 42 communicating with hole 14 and a conduit of download 43 that communicates with the download camera 37. The camera control 41 is defined, at the bottom, by the surface upper rod 8; and, under the greater area of the upper surface of rod 8 compared to shoulder 22 (figure 1), the fuel pressure, with the help of the spring 23, holds rod 8 normally in a position such that close the hole 11 of the nozzle 9.
El conducto de descarga 43 de la cámara de control 41 está cerrado normalmente por un obturador en forma de una bola 44, la cual descansa sobre un asiento cónico definido por la superficie de contacto con el conducto 43; la bola 44 es guiada por una placa de guía 46 sobre la cual actúa un elemento intermedio que comprende un vástago cilíndrico 47; y la armadura 27 forma una sola pieza con un manguito 48 que desliza axialmente a lo largo del vástago 47, que comprende un anillo 49 en forma de C que coopera con un hombro 50 de la armadura 27, de manera que la armadura 27 queda desconectada del vástago 47.The discharge duct 43 of the chamber control 41 is normally closed by a shutter in the form of a ball 44, which rests on a conical seat defined by the contact surface with conduit 43; ball 44 is guided by a guide plate 46 on which an intermediate element acts that it comprises a cylindrical rod 47; and armor 27 forms a single piece with a sleeve 48 that slides axially along the stem 47, which comprises a C-shaped ring 49 that cooperates with  one shoulder 50 of the armor 27, so that the armor 27 is disconnected from stem 47.
Una longitud determinada del vástago 47 se proyecta al interior del agujero 31 y termina con una porción de diámetro pequeño 51 para soportar y anclar un primer resorte de compresión 52 alojado dentro del agujero 31; el vástago 47 desliza por el interior de una guía que comprende un casquillo cilíndrico 53 que forma una sola pieza con una pestaña inferior 54 que comprende orificios axiales 56; y, en la parte inferior, el vástago 47 comprende una pestaña integrada 57 que se apoya contra la superficie inferior de la pestaña 54.A certain length of the stem 47 is projects into hole 31 and ends with a portion of small diameter 51 to support and anchor a first spring of compression 52 housed inside hole 31; the stem 47 slides on the inside of a guide comprising a cylindrical bushing 53 which forms a single piece with a bottom flange 54 comprising axial holes 56; and, at the bottom, the stem 47 it comprises an integrated flange 57 that rests against the lower surface of the flange 54.
La pestaña 54 es obligada por la tuerca anular 36 contra la pestaña 34 del cuerpo 33 de la válvula 24 por vía de la interposición de arandelas calibradas, para definir el desplazamiento deseado "h" del vástago 47; y el resorte 52 es precargado a una fuerza F1 para que el vástago 47 pueda mover la armadura 27 rápidamente hacia abajo cuando se desactiva el electroimán 26 y, por medio de la placa 46, mantener la bola 44 en la posición cerrada en el conducto 43.The flange 54 is forced by the ring nut 36 against the flange 34 of the body 33 of the valve 24 via the interposition of calibrated washers, to define the desired displacement "h" of the stem 47; and spring 52 is preloaded to a force F1 so that the stem 47 can move the armor 27 quickly down when the electromagnet 26 and, by means of plate 46, keep ball 44 in the closed position in the conduit 43.
La pestaña 57 del vástago 47 está alojada dentro de una cámara de turbulencia 58 en donde el combustible descargado desde la cámara de control 41 es comprimido y expansionado por el movimiento de la pestaña 57; y el casquillo 53 forma con la tuerca anular 36 un espacio de separación 59 que permite que el combustible de la cámara 58 fluya a través de los agujeros 56 al interior de la cámara de descarga 37.The tab 57 of the stem 47 is housed inside of a turbulence chamber 58 where the fuel discharged from the control chamber 41 it is compressed and expanded by the eyelash movement 57; and the sleeve 53 forms with the nut annul 36 a separation space 59 that allows the fuel  of chamber 58 flow through holes 56 into the discharge chamber 37.
De acuerdo con la invención, el vástago 47 comprende una porción 61 sobre la cual desliza el manguito 48 de la armadura 27, y una porción 62 que desliza por el interior del casquillo 53 y que es de mayor diámetro que la porción 61; y un hombro anular 63 queda definido entre las porciones 61 y 62 para soportar un segundo resorte 64, que actúa sobre la armadura 27 con el fin de mantener normalmente el hombro 50 descansando contra el anillo 49 del vástago 47.According to the invention, the stem 47 it comprises a portion 61 on which the sleeve 48 of the armor 27, and a portion 62 that slides inside the bush 53 and which is larger in diameter than portion 61; and a annular shoulder 63 is defined between portions 61 and 62 to withstand a second spring 64, which acts on the armature 27 with in order to normally keep the shoulder 50 resting against the ring 49 of the stem 47.
Más concretamente, el resorte 64 puede ser un resorte de múltiples láminas que, de acuerdo con la variante de la figura 2, comprende un paquete de pares de arandelas Belleville coaxiales 66; la arandela superior 66 descansa contra la armadura 27 y la arandela inferior 66 contra el hombro 63; y el resorte 64, precargado a una fuerza F2, queda acoplado entre el disco de la armadura 27 y el hombro anular 63.More specifically, the spring 64 may be a multi-leaf spring which, according to the variant of the Figure 2, comprises a pack of pairs of Belleville washers coaxial 66; the upper washer 66 rests against the armor 27 and lower washer 66 against shoulder 63; and spring 64, preloaded to a force F2, is coupled between the disk of the armor 27 and annular shoulder 63.
Al liberarse el vástago 47 por sí mismo, el resorte 64 puede ser incrementado en cualquier cantidad para reducir el retorno al momento de descanso de la armadura 27, y así reducir el intervalo de tiempo entre dos operaciones consecutivas de la válvula dosificadora 24 por el electroimán 26. El resorte 64, de hecho, deja ya de afectar al asentado de la válvula 44, lo cual es asegurado exclusivamente por el resorte 52 que, al no tener que salvar la fuerza del resorte contrarrestante 64, aporta un movimiento más eficaz de la bola 44 hacia la posición cerrada. Alternativamente, para una determinada acción de la bola 44, la precarga o dimensión del resorte 52 se puede reducir.When stem 47 is released by itself, the spring 64 can be increased by any amount to reduce the return to the resting moment of armor 27, and thus reduce the time interval between two consecutive operations of the metering valve 24 by electromagnet 26. Spring 64, of In fact, it no longer affects the seating of valve 44, which is secured exclusively by spring 52 which, not having to save the force of the counteracting spring 64, provides a more efficient movement of the ball 44 towards the closed position. Alternatively, for a given action of ball 44, the preload or dimension of spring 52 can be reduced.
El inyector descrito funciona como sigue.The injector described works as follows.
Cuando la bobina 29 es activada, el núcleo 28 atrae a la armadura 27 que, por medio del hombro 50 y del anillo 49 en forma de C, retira positivamente el vástago 47 hacia arriba en oposición al resorte 52; la pestaña 57 del vástago 47 produce turbulencia dentro de la cámara 58, es decir, el combustible de la cámara 58 se comprime por un lado y se expansiona por otro, para absorber la parada de la pestaña 57 del vástago 47 contra la pestaña fija 54; y la armadura 27 es frenada por el combustible dentro de la cámara de descarga 37 y detenida con el hombro 50 contra el anillo 49. Por tanto, la desconexión de la armadura 27 y del vástago 47 proporciona la absorción de la energía cinética de los dos componentes por separado.When coil 29 is activated, core 28 attracts armor 27 which, by means of shoulder 50 and ring 49 C-shaped, positively remove stem 47 upwards in opposition to spring 52; tab 57 of stem 47 produces turbulence inside chamber 58, that is, the fuel of the chamber 58 is compressed on one side and expanded on the other, to absorb the stop of the flange 57 of the stem 47 against the fixed tab 54; and armor 27 is stopped by fuel inside the discharge chamber 37 and stopped with the shoulder 50 against ring 49. Therefore, the disconnection of the armature 27 and of the stem 47 provides the absorption of the kinetic energy of The two components separately.
En consecuencia, la presión del combustible dentro de la cámara 41 desplaza a la bola 44 hacia la posición abierta para descargar el combustible de la cámara 41 de nuevo al interior del depósito; y la presión del combustible dentro de la cámara 19 (figura 1) contrarresta la presión residual sobre la superficie superior de la varilla 8 para subir el pasador 12 y así inyectar el combustible de la cámara 19 a través del orificio 11.Consequently, the fuel pressure inside the chamber 41 moves the ball 44 towards the position open to discharge the fuel from chamber 41 back to inside the tank; and the fuel pressure inside the chamber 19 (figure 1) counteracts the residual pressure on the upper surface of rod 8 to raise pin 12 and so inject fuel from chamber 19 through the hole eleven.
Cuando la bobina 29 es desactivada, el resorte 52 empuja al vástago 47 hacia abajo con el fin de retirar la armadura 27 descendentemente por medio del anillo 49; la energía cinética del vástago 47 es también parcialmente disipada por la turbulencia creada por la pestaña 57 en la cámara interior de combustible 58, con el fin de absorber eficientemente el impacto y eliminar de forma sustancial el rebote del vástago 47, placa 46 y bola 44; la bola 44 cierra el conducto de descarga 43; y el fluido a presión restablece la presión dentro de la cámara de control 41, de modo que el pasador 12 (figura 1) cierra el orificio 11.When coil 29 is deactivated, the spring 52 pushes the stem 47 down in order to remove the armor 27 descending through ring 49; energy Kinetic of the stem 47 is also partially dissipated by the turbulence created by tab 57 in the inner chamber of fuel 58, in order to efficiently absorb the impact and substantially eliminate the rebound of the stem 47, plate 46 and ball 44; the ball 44 closes the discharge conduit 43; and the fluid Pressurized resets the pressure inside the control chamber 41, so that pin 12 (figure 1) closes hole 11.
En las variantes de las figuras 3-6, las porciones 61 y 62 del vástago 47 tienen el mismo diámetro y, por tanto, son más económicas de producir y quedan separadas por una acanaladura 65 en la cual se adapta otro anillo 70 en forma de C que actúa como un hombro. En las variantes de las figuras 3, 4 y 5, el resorte de múltiples láminas 64 comprende un número de orejetas elásticas 67 que forman una sola pieza con un disco cóncavo 68 que presenta un agujero central 69 y que descansa sobre el anillo 70; y las orejetas 67 están presentes en un número igual al de sectores 38 y descansan contra estos últimos.In the variants of the figures 3-6, portions 61 and 62 of stem 47 have the same diameter and therefore are cheaper to produce and they are separated by a groove 65 in which another one is adapted C-shaped ring 70 that acts as a shoulder. In the variants of figures 3, 4 and 5, the multi-leaf spring 64 it comprises a number of elastic lugs 67 that form a single piece with a concave disc 68 that has a central hole 69 and resting on ring 70; and lugs 67 are present in a number equal to that of sectors 38 and rest against these last.
Para impedir que la armadura 27 y el resorte 64 giren entre sí, en la variante de las figuras 3 y 4, el disco 68 comprende un apéndice 71 localizado entre dos orejetas 67 y acoplándose con una ranura 39 entre dos sectores adyacentes 38; y en la variante de la figura 5, uno de los sectores 38 de la armadura 27 comprende una cavidad 72 acoplada con una de las orejetas elásticas 67 del resorte 64.To prevent armor 27 and spring 64 turn each other, in the variant of figures 3 and 4, disk 68 comprises an appendix 71 located between two lugs 67 and engaging with a slot 39 between two adjacent sectors 38; Y in the variant of figure 5, one of sectors 38 of the armor 27 comprises a cavity 72 coupled with one of the elastic lugs 67 of spring 64.
Por último, en la variante de la figura 6, un resorte de compresión helicoidal 64 en forma de tronco de cono está precargado entre la armadura 27 y el anillo 70 en forma de C, entrando en contacto la espira de mayor diámetro con la armadura 27 y entrando en contacto la espira de menor diámetro con el anillo 70.Finally, in the variant of Figure 6, a 64-shaped helical compression spring in the shape of a cone is preloaded between the armature 27 and the C-shaped ring 70, the largest diameter spiral coming into contact with the armature 27 and coming in contact with the smaller diameter loop with the ring 70.
En comparación con los inyectores conocidos, las ventajas del inyector 5 de acuerdo con la invención resultarán más evidentes a partir de la descripción anterior. En particular, la velocidad de retorno de la armadura 27 se puede incrementar sin tener que aumentar la precarga del resorte contrarrestante 52. Por tanto, no es necesario aumentar la fuerza del electroimán 26 o la dimensión del núcleo magnético 28; no es necesario utilizar materiales especiales de mayor resistencia mecánica o de mayor coste de fabricación y, finalmente, la precarga o dimensión del resorte 64 se puede reducir para simplificar el montaje.Compared to known injectors, the advantages of the injector 5 according to the invention will result more evident from the previous description. In particular, the armature return speed 27 can be increased without having to increase the preload of the counterbalance spring 52. therefore, it is not necessary to increase the strength of the electromagnet 26 or the dimension of the magnetic core 28; no need to use special materials with greater mechanical resistance or greater manufacturing cost and, finally, the preload or dimension of the Spring 64 can be reduced to simplify assembly.
Evidentemente, se pueden realizar cambios en el inyector tal y como ha sido aquí descrito e ilustrado, sin por ello desviarse del alcance de la presente invención tal y como queda definida por las reivindicaciones adjuntas. Por ejemplo, el resorte 64, 74 puede ser de un tipo distinto al descrito. En particular, en la variante de las figuras 3 y 4, el resorte 64 puede comprender dos o más apéndices 71; en la variante de la figura 5, los sectores 38 de la armadura 27 pueden comprender cada uno de ellos una cavidad 72; y en la variante de la figura 6, el resorte de compresión helicoidal 74 puede ser cilíndrico en contraposición con un resorte de configuración tronco-cónica.Obviously, changes can be made to the injector as described and illustrated here, without it deviate from the scope of the present invention as it stands defined by the appended claims. For example, the spring 64, 74 may be of a different type than described. In particular, in the variant of figures 3 and 4, the spring 64 may comprise two or more appendices 71; in the variant of figure 5, the sectors 38 of armor 27 can each comprise a cavity 72; and in the variant of figure 6, the spring of helical compression 74 can be cylindrical as opposed to a spring of conical trunk configuration.

Claims (12)

1. Un inyector de combustible que comprende un cuerpo hueco (6) conectado a una tobera (9) que termina con uno o más orificios de inyección (11); una varilla de control (8), que desliza por el interior del cuerpo hueco (6) y está conectada en su primer extremo a un pasador (12) para cerrar dichos orificios (11); una válvula electromagnética dosificadora que comprende un obturador (44) para un conducto de descarga (43) de una cámara de control (41), que recibe un segundo extremo de la varilla de control (8); un primer resorte (52) que actúa contra un elemento intermedio (47) para mantener dicho obturador (44) en la posición cerrada; y un electroimán (26) para activar una armadura (27) para controlar dicho obturador (44) por vía de dicho elemento intermedio (47); estando dicha armadura (27) desconectada de dicho elemento intermedio (47) y quedando retenida descansando contra dicho elemento intermedio (47) mediante un segundo resorte (64, 74); con lo que dicho segundo resorte (64, 74) queda precargado entre dicha armadura (27) y dicho elemento intermedio (47), con el fin de no afectar a la acción de dicho primer resorte (52).1. A fuel injector comprising a hollow body (6) connected to a nozzle (9) that ends with one or more injection holes (11); a control rod (8), which slides inside the hollow body (6) and is connected in its first end to a pin (12) to close said holes (11); an electromagnetic metering valve comprising a shutter (44) for a discharge duct (43) of a chamber control (41), which receives a second end of the control rod (8); a first spring (52) acting against an intermediate element (47) to keep said shutter (44) in the closed position; and a electromagnet (26) to activate armor (27) to control said shutter (44) via said intermediate element (47); said armor (27) being disconnected from said element intermediate (47) and being held resting against said intermediate element (47) by a second spring (64, 74); with what said second spring (64, 74) is preloaded between said armor (27) and said intermediate element (47), in order not to affect the action of said first spring (52).
2. Un inyector según la reivindicación 1, en donde dicha armadura presenta sustancialmente la forma de un disco (27) que forma una sola pieza con un manguito (48), y dicho elemento intermedio presenta la forma de un vástago (47) coaxial con dicho disco (27); deslizando dicho manguito (48) sobre dicho vástago (47); caracterizado porque dicho segundo resorte (64, 74) está precargado entre dicho disco (27) y un hombro anular (63, 70) de dicho vástago (47).2. An injector according to claim 1, wherein said armature substantially has the shape of a disk (27) that forms a single piece with a sleeve (48), and said intermediate element has the shape of a coaxial rod (47) with said disk (27); sliding said sleeve (48) over said rod (47); characterized in that said second spring (64, 74) is preloaded between said disk (27) and an annular shoulder (63, 70) of said rod (47).
3. Un inyector según la reivindicación 2, caracterizado porque dicho segundo resorte es un resorte de múltiples láminas (64).3. An injector according to claim 2, characterized in that said second spring is a multi-leaf spring (64).
4. Un inyector según la reivindicación 3, caracterizado porque dicho resorte de múltiples láminas (64) comprende un número de arandelas Belleville coaxiales (66); estando definido dicho hombro (63) entre una primera porción (61) de dicho vástago (47) sobre la cual desliza dicha armadura (27), y una segunda porción (62) de dicho vástago (47) que desliza por el interior de un casquillo fijo (53).An injector according to claim 3, characterized in that said multi-blade spring (64) comprises a number of coaxial Belleville washers (66); said shoulder (63) being defined between a first portion (61) of said rod (47) on which said armature (27) slides, and a second portion (62) of said rod (47) that slides inside a fixed bushing (53).
5. Un inyector según la reivindicación 3, caracterizado porque dicha armadura (27) comprende un número de sectores (38) separados por ranuras (39); y un resorte de láminas (64) definido como un disco cóncavo (68) que tiene un número de orejetas elásticas (67) igual al número de dichos sectores (38) y acoplándose cada una de ellas con el correspondiente de dichos sectores (38).5. An injector according to claim 3, characterized in that said reinforcement (27) comprises a number of sectors (38) separated by grooves (39); and a leaf spring (64) defined as a concave disk (68) having a number of elastic lugs (67) equal to the number of said sectors (38) and each of them coupling with the corresponding one of said sectors (38) .
6. Un inyector según la reivindicación 5, caracterizado porque están previstos medios (71, 72) entre dicho disco cóncavo (68) y dicha armadura (27) y para impedir la rotación mutua de dicho disco y de dicha armadura.6. An injector according to claim 5, characterized in that means (71, 72) are provided between said concave disc (68) and said armature (27) and to prevent mutual rotation of said disc and said armature.
7. Un inyector según la reivindicación 6, caracterizado porque dichos medios (71, 72) comprenden al menos un apéndice (71) situado sobre dicho disco cóncavo (68) y acoplándose con una de dichas ranuras (39).7. An injector according to claim 6, characterized in that said means (71, 72) comprise at least one appendix (71) located on said concave disc (68) and engaging with one of said slots (39).
8. Un inyector según la reivindicación 7, caracterizado porque dichos medios (71, 72) comprenden una cavidad (72) situada sobre al menos uno de dichos sectores (38) de dicha armadura (27) y acoplada con la correspondiente orejeta (67) de dicho disco cóncavo (68).An injector according to claim 7, characterized in that said means (71, 72) comprise a cavity (72) located on at least one of said sectors (38) of said reinforcement (27) and coupled with the corresponding lug (67) of said concave disc (68).
9. Un inyector según la reivindicación 2, caracterizado porque dicho segundo resorte (74) es un resorte de compresión helicoidal en forma de tronco de cono o cilíndrico.9. An injector according to claim 2, characterized in that said second spring (74) is a helical compression spring in the form of a cone or cylindrical trunk.
10. Un inyector según cualquiera de las reivindicaciones 5 a 9, caracterizado porque dicho hombro comprende un anillo (70) alojado dentro de una acanaladura (65) en dicho vástago (47); acoplándose dicho disco cóncavo (68) con dicho anillo (70).10. An injector according to any one of claims 5 to 9, characterized in that said shoulder comprises a ring (70) housed inside a groove (65) in said rod (47); said concave disc (68) being coupled with said ring (70).
11. Un inyector según la reivindicación 4, caracterizado porque dichas primera y segunda porciones (61, 62) son del mismo diámetro.11. An injector according to claim 4, characterized in that said first and second portions (61, 62) are of the same diameter.
12. Un inyector según cualquiera de las reivindicaciones 2 a 11, caracterizado porque dicho vástago (47) comprende una pestaña (57) que puede moverse por el interior de una cámara de turbulencia (58) situada entre dicha cámara de control (41) y una cámara de descarga (37) en la que la descarga combustible precedente de dicha cámara de control (41).12. An injector according to any of claims 2 to 11, characterized in that said rod (47) comprises a flange (57) that can move inside a turbulence chamber (58) located between said control chamber (41) and a discharge chamber (37) in which the preceding fuel discharge from said control chamber (41).
ES97122647T 1996-12-23 1997-12-22 PERFECTED ELECTROMAGNETIC VALVE TO DOSAGE A FUEL INJECTOR. Expired - Lifetime ES2300111T3 (en)

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IT96TO001074A IT1289794B1 (en) 1996-12-23 1996-12-23 Improvements to an electromagnetically controlled metering valve for a fuel injector.

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JP (1) JPH10196485A (en)
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DE69738520T2 (en) 2008-06-19
EP0851116B1 (en) 2008-02-20
RU2200868C2 (en) 2003-03-20
EP0851116A2 (en) 1998-07-01
CN1190697A (en) 1998-08-19
JPH10196485A (en) 1998-07-28
ITTO961074A1 (en) 1998-06-23
EP0851116A3 (en) 1999-04-14
IT1289794B1 (en) 1998-10-16
KR19980064482A (en) 1998-10-07
CN1096549C (en) 2002-12-18
US5820101A (en) 1998-10-13

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